Air conditioning unit heating control method and device and air conditioning unit

Abstract

The application discloses a kind of air conditioning unit heating control method, device and air conditioning unit.The air conditioning unit includes first compressor and second compressor in parallel, the rated heating capacity of first compressor is greater than the rated heating capacity of second compressor, and the method comprises: the difference between indoor target temperature and outdoor temperature is calculated;According to the difference, determine the compressor that needs to be started;When first compressor needs to be started, the initial load of first compressor is determined according to the difference;Then, according to the actual temperature in the room and the current load of first compressor, adjust the load of first compressor or switch the compressor, until the actual temperature in the room reaches the indoor target temperature.The application considers winter low temperature heating and summer high temperature heating, balances the unit capacity under different working conditions, avoids frequent start and stop of compressor, maintains stable indoor temperature while ensuring reliable operation of unit, solves the problem that air conditioning unit considers winter low temperature heating and summer high temperature heating, which leads to frequent start and stop of compressor.

Description

Technical Field

[0001] This invention relates to the field of unit technology, and more specifically, to a heating control method, device, and air conditioning unit for an air conditioning unit. Background Technology

[0002] Currently, many process plants and laboratories have high requirements for indoor temperature and need to maintain a high temperature range for a long time. However, most existing units have difficulty taking into account both low-temperature heating in winter and high-temperature heating in summer, resulting in unstable operation. Even if they do manage to do so, it often comes at the cost of frequent compressor start-stop, which has a significant impact on the reliability of the unit.

[0003] There is currently no effective solution to the problem of frequent compressor start-stop cycles in existing air conditioning units that need to handle both low-temperature heating in winter and high-temperature heating in summer. Summary of the Invention

[0004] This invention provides a heating control method, device, and air conditioning unit to at least solve the problem of frequent compressor start-stop caused by air conditioning units simultaneously providing heating at low temperatures in winter and high temperatures in summer in the prior art.

[0005] To address the aforementioned technical problems, this invention provides a heating control method for an air conditioning unit. The air conditioning unit includes a first compressor and a second compressor connected in parallel, wherein the rated heating capacity of the first compressor is greater than that of the second compressor. The method includes:

[0006] Calculate the difference between the target indoor temperature and the outdoor ambient temperature;

[0007] The compressor that needs to be turned on is determined based on the difference.

[0008] When the first compressor needs to be turned on, the initial load of the first compressor is determined based on the difference.

[0009] Then, based on the actual indoor temperature and the current load of the first compressor, the load of the first compressor is adjusted or the compressor is switched until the actual indoor temperature reaches the target indoor temperature.

[0010] Optionally, determining which compressor needs to be turned on based on the difference includes:

[0011] If the difference is greater than the first threshold, the current operating condition is determined to be low-temperature heating, and the first compressor is turned on;

[0012] If the difference is less than or equal to the first threshold, the current operating condition is determined to be high-temperature heating, and the compressor to be turned on is determined according to the interval in which the difference is located. Specifically, when the interval in which the difference is located is the minimum interval, the second compressor is turned on; when the interval in which the difference is located is not the minimum interval, the first compressor is turned on.

[0013] Optionally, determining the initial load of the first compressor based on the difference includes:

[0014] Determine the interval containing the difference;

[0015] Based on the pre-stored correspondence between intervals and load levels, the load level corresponding to the interval containing the difference is determined and used as the initial load of the first compressor.

[0016] The first compressor is equipped with a minimum load setting, at least one intermediate load setting, and a maximum load setting; the smaller the range, the smaller the corresponding load setting.

[0017] Optionally, based on the actual indoor temperature and the current load of the first compressor, the load of the first compressor is adjusted or the compressor is switched until the actual indoor temperature reaches the target indoor temperature, including:

[0018] If the current load of the first compressor is at the minimum load setting, the actual indoor temperature is obtained after the first compressor has been running at the minimum load setting for a first preset time.

[0019] If the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value for a second consecutive preset time, then the first compressor is controlled to maintain the current load operation.

[0020] If the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, the first compressor will be increased to the next load level after the minimum load level.

[0021] If the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time period, or if the first compressor repeatedly starts and stops a preset number of times for a third consecutive preset time period, then the first compressor is turned off and the second compressor is turned on.

[0022] Optionally, after the second compressor is turned on, the following steps are also included:

[0023] If the actual running time of the second compressor is greater than or equal to the fourth preset time, then switch to the first compressor, and the first compressor is turned on to the minimum load setting;

[0024] If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value, then the second compressor is controlled to continue running.

[0025] If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is less than or equal to the difference between the indoor target temperature and the preset value, then the compressor is switched to the first compressor, and the first compressor is set to the minimum load setting.

[0026] Optionally, based on the actual indoor temperature and the current load of the first compressor, the load of the first compressor is adjusted or the compressor is switched until the actual indoor temperature reaches the target indoor temperature, including:

[0027] If the current load of the first compressor is at the intermediate load setting, the actual indoor temperature is obtained after the first compressor has been running at the intermediate load setting for a first preset time.

[0028] If the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value for a second consecutive preset time, then the first compressor is controlled to maintain the current load operation.

[0029] If the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, then the first compressor will be increased to the next load level of the current load.

[0030] If the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time, or if the first compressor repeatedly starts and stops a preset number of times for a third consecutive preset time, then the first compressor will be reduced to the load level above the current load.

[0031] Optionally, based on the actual indoor temperature and the current load of the first compressor, the load of the first compressor is adjusted or the compressor is switched until the actual indoor temperature reaches the target indoor temperature, including:

[0032] If the current load of the first compressor is the maximum load setting, after the first compressor runs at the maximum load setting for a first preset time, it is determined whether the number of times the first compressor repeatedly starts and stops within a third preset time has reached a preset number.

[0033] If so, the first compressor is reduced to the load level above the maximum load level.

[0034] Optionally, the air conditioning unit further includes: at least two outdoor heat exchangers connected in parallel;

[0035] With the first compressor running, all outdoor heat exchangers are activated.

[0036] When the second compressor is turned on, a specified portion of the at least two outdoor heat exchangers is turned on.

[0037] This invention also provides a heating control device for an air conditioning unit, the air conditioning unit including a first compressor and a second compressor connected in parallel, the rated heating capacity of the first compressor being greater than that of the second compressor, the device comprising:

[0038] The calculation module is used to calculate the difference between the indoor target temperature and the outdoor ambient temperature.

[0039] The first determining module is used to determine the compressor that needs to be turned on based on the difference;

[0040] The second determining module is used to determine the initial load of the first compressor based on the difference when the first compressor needs to be turned on.

[0041] The control module is used to adjust the load of the first compressor or switch compressors based on the actual indoor temperature and the current load of the first compressor until the actual indoor temperature reaches the target indoor temperature.

[0042] This invention also provides an air conditioning unit, including: the air conditioning unit heating control device described in this invention.

[0043] This invention also provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described in this invention.

[0044] This invention also provides a non-volatile computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method described in this invention.

[0045] By applying the technical solution of this invention, a first compressor and a second compressor are connected in parallel in the air conditioning unit. The rated heating capacity of the first compressor is greater than that of the second compressor. Based on the difference between the target indoor temperature and the outdoor ambient temperature, the operating condition of the air conditioning unit can be determined, thereby determining which compressor needs to be activated and the initial load when the first compressor is activated. Then, based on the actual indoor temperature and the current load of the first compressor, the load of the first compressor is adjusted or the compressor is switched until the actual indoor temperature reaches the target indoor temperature. This allows for both low-temperature heating in winter and high-temperature heating in summer, balancing the unit's capacity under different operating conditions. It avoids meeting user needs at the expense of frequent compressor start-stops, ensuring reliable and stable operation of the unit under different conditions while maintaining stable indoor temperature and meeting user heating requirements. This solves the problem of frequent compressor start-stops caused by air conditioning units balancing low-temperature heating in winter and high-temperature heating in summer. Attached Figure Description

[0046] Figure 1 This is a flowchart of the air conditioning unit heating control method provided in Embodiment 1 of the present invention;

[0047] Figure 2 This is a schematic diagram of the air conditioning unit provided in Embodiment 2 of the present invention;

[0048] Figure 3 This is a flowchart of compressor load control during heating provided in Embodiment 2 of the present invention;

[0049] Figure 4 This is a structural block diagram of the air conditioning unit heating control device provided in Embodiment 3 of the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0051] It should be noted that the terms "first," "second," etc., used in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0053] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0054] Example 1

[0055] This embodiment provides a heating control method for an air conditioning unit. The air conditioning unit includes a first compressor and a second compressor connected in parallel. The rated heating capacity of the first compressor is greater than that of the second compressor. It is understood that the first compressor has a large capacity and is suitable for low-temperature heating in autumn and winter; the second compressor has a small capacity and is suitable for high-temperature heating in summer. The first compressor can be selected according to actual installation requirements, and it must meet the winter heating needs of the region. The compressor in this embodiment can be a fixed-frequency compressor or a variable-frequency compressor.

[0056] Figure 1 This is a flowchart of the air conditioning unit heating control method provided in Embodiment 1 of the present invention, as follows: Figure 1 As shown, the method includes the following steps:

[0057] S101, calculate the difference between the indoor target temperature and the outdoor ambient temperature. Specifically, this difference can be obtained by subtracting the outdoor ambient temperature from the indoor target temperature, or by calculating the absolute value of the difference.

[0058] S102, determine the compressor that needs to be turned on based on the difference.

[0059] S103, when it is necessary to start the first compressor, the initial load of the first compressor is determined according to the difference.

[0060] S104. After that, based on the actual indoor temperature and the current load of the first compressor, adjust the load of the first compressor or switch the compressor until the actual indoor temperature reaches the target indoor temperature.

[0061] This embodiment sets up a first compressor and a second compressor connected in parallel in the air conditioning unit. The rated heating capacity of the first compressor is greater than that of the second compressor. Based on the difference between the indoor target temperature and the outdoor ambient temperature, the operating condition of the air conditioning unit can be determined, thereby determining which compressor needs to be turned on and the initial load when the first compressor is turned on. Then, based on the actual indoor temperature and the current load of the first compressor, the load of the first compressor is adjusted or the compressor is switched until the actual indoor temperature reaches the indoor target temperature. This can take into account both low-temperature heating in winter and high-temperature heating in summer, balancing the unit's capacity under different operating conditions, avoiding the need for frequent compressor start-stop to meet user needs, and ensuring reliable and stable operation of the unit under different operating conditions while maintaining stable indoor temperature and meeting user heating needs. This solves the problem of frequent compressor start-stop caused by the air conditioning unit trying to perform both low-temperature heating in winter and high-temperature heating in summer.

[0062] In one implementation, determining which compressor needs to be turned on based on the difference includes:

[0063] If the difference is greater than the first threshold, the current operating condition is determined to be low-temperature heating, and the first compressor is turned on;

[0064] If the difference is less than or equal to the first threshold, the current operating condition is determined to be high-temperature heating, and the compressor to be turned on is determined according to the interval in which the difference is located. Specifically, when the interval in which the difference is located is the minimum interval, the second compressor is turned on; when the interval in which the difference is located is not the minimum interval, the first compressor is turned on.

[0065] The first threshold is used to characterize the degree of difference between the indoor target temperature and the outdoor ambient temperature. This first threshold can be set according to actual conditions. If the difference is greater than the first threshold, it indicates a large difference between the indoor target temperature and the outdoor ambient temperature, indicating a low-temperature heating condition. In this case, a larger capacity first compressor can be used for heating. If the difference is less than or equal to the first threshold, it indicates a small difference between the indoor target temperature and the outdoor ambient temperature, indicating a high-temperature heating condition. In this case, the temperature difference range can be further subdivided to determine whether to use the first compressor or the second compressor. For example, the temperature difference range can be further divided using a second threshold, a third threshold, etc. (all less than the first threshold).

[0066] This implementation method, based on the difference between the indoor target temperature and the outdoor ambient temperature, can reliably determine the current operating conditions and the compressor to be used, thereby avoiding the problem of frequent compressor start-stop caused by the compressor load being far greater than the heating demand.

[0067] In one embodiment, determining the initial load of the first compressor based on the difference includes: determining the interval in which the difference is located; determining the load level corresponding to the interval in which the difference is located, based on a pre-stored correspondence between intervals and load levels, as the initial load of the first compressor; wherein the first compressor is provided with a minimum load level, at least one intermediate load level, and a maximum load level; the smaller the interval, the smaller the corresponding load level.

[0068] Each interval corresponds one-to-one with a load level, and the number of intervals and load levels can be set according to actual conditions. For example, interval 1 corresponds to load level (25%), interval 2 corresponds to load level (50%), interval 3 corresponds to load level (75%), and interval 4 corresponds to load level (100%).

[0069] This implementation method, based on the difference between the indoor target temperature and the outdoor ambient temperature, as well as the correspondence between the pre-stored range and the load level, can reasonably determine the initial load of the first compressor and avoid frequent start-stop due to excessive compressor load.

[0070] The following explains the process of "adjusting the load of the first compressor or switching compressors based on the actual indoor temperature and the current load of the first compressor until the actual indoor temperature reaches the target indoor temperature," including the following scenarios:

[0071] (1) If the current load of the first compressor is the minimum load setting, after the first compressor runs at the minimum load setting for a first preset time, the actual indoor temperature is obtained; if the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value for a second consecutive preset time, the first compressor is controlled to maintain the current load operation; if the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, the first compressor is increased to the next load setting below the minimum load setting; if the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time, or if the first compressor is repeatedly started and stopped a preset number of times for a third consecutive preset time, the first compressor is turned off and the second compressor is turned on.

[0072] The first preset time, second preset time, third preset time, preset number of times, and preset value can be set according to actual conditions. The preset value can be relatively small, for example, 0.5℃. For example, the preset number of times can be 3 times, the second preset time can be 1 minute, and the first preset time can be 8 hours.

[0073] In this embodiment, when the current load of the first compressor is at the minimum load setting, the load of the first compressor is increased in a timely manner or switched to a second compressor that can provide a smaller load, based on the relationship between the actual indoor temperature and the target indoor temperature. This ensures that the actual indoor temperature is stabilized at the target indoor temperature, meets the user's heating needs, and does not cause the compressor to start and stop frequently.

[0074] (2) If the current load of the first compressor is at the intermediate load level, after the first compressor runs at the intermediate load level for a first preset time, the actual indoor temperature is obtained; if the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value for a second consecutive preset time, the first compressor is controlled to maintain the current load operation; if the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, the first compressor is increased to the next load level of the current load; if the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time, or if the first compressor is repeatedly started and stopped a preset number of times for a third consecutive preset time, the first compressor is reduced to the previous load level of the current load.

[0075] In this embodiment, when the current load of the first compressor is at the intermediate load setting, the load of the first compressor is increased or decreased in a timely manner according to the relationship between the actual indoor temperature and the target indoor temperature, so that the actual indoor temperature is stabilized at the target indoor temperature, meeting the user's heating needs, and without causing the compressor to start and stop frequently.

[0076] (3) If the current load of the first compressor is the maximum load setting, after the first compressor runs at the maximum load setting for a first preset time, determine whether the number of times the first compressor is repeatedly started and stopped within a third preset time has reached the preset number; if so, reduce the first compressor to the load setting above the maximum load setting.

[0077] This implementation method, when the current load of the first compressor is at its maximum load setting, reduces the load of the first compressor in a timely manner based on the number of times the first compressor starts and stops repeatedly within a certain period of time, thereby stabilizing the actual indoor temperature at the target indoor temperature, meeting the user's heating needs, and preventing the compressor from frequently starting and stopping.

[0078] In one embodiment, after the second compressor is turned on, the method further includes:

[0079] If the actual running time of the second compressor is greater than or equal to the fourth preset time, then switch to the first compressor, and the first compressor is set to the minimum load setting;

[0080] If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value, then the second compressor will continue to run.

[0081] If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is less than or equal to the difference between the indoor target temperature and the preset value, then switch to the first compressor, and the first compressor is set to the minimum load setting.

[0082] The fourth preset time is the limited operating time of the second compressor, and the fourth preset time can be set according to the actual situation.

[0083] This implementation method allows for timely switching of the compressor when a small-capacity second compressor is activated, ensuring the user's heating needs are met.

[0084] In one embodiment, the air conditioning unit further includes at least two outdoor heat exchangers connected in parallel. The at least two outdoor heat exchangers can be identical. Valves are installed on the inlet and outlet pipes of some of the outdoor heat exchangers. When the valves are closed, the corresponding outdoor heat exchanger is not connected to the refrigerant circulation loop; when the valves are open, the corresponding outdoor heat exchanger is connected to the refrigerant circulation loop.

[0085] With the first compressor running, all outdoor heat exchangers are activated. With the second compressor running, fewer outdoor heat exchangers are needed; in this case, valves can be closed to activate only a specified portion of the at least two outdoor heat exchangers. This ensures proper matching between the outdoor heat exchangers and the compressor.

[0086] Example 2

[0087] The heating control method of the air conditioning unit described above will be explained below with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustration of this application and does not constitute an improper limitation of this application. The same or corresponding terms used in the above embodiments will not be repeated in this embodiment. This embodiment takes indoor hot water production as an example, that is, heat exchange between water and refrigerant is used on the indoor side. Of course, heat exchange between air and refrigerant can also be used on the indoor side.

[0088] like Figure 2 The diagram shown is a schematic of an air conditioning unit, which includes: a first compressor 1, a second compressor 2, solenoid valves 3 and 4, a fan 5, an outdoor finned heat exchanger 6, solenoid valves 7 and 8, an electronic expansion valve 9, and an indoor water-side heat exchanger 10.

[0089] The high-temperature, high-pressure gaseous refrigerant discharged from either the first compressor 1 or the second compressor 2 enters the indoor water-side heat exchanger 10 to exchange heat with water and produce hot water. Here, the high-temperature, high-pressure gaseous refrigerant is condensed into a high-pressure, medium-temperature liquid refrigerant. This liquid refrigerant is then throttled by the electronic expansion valve 9 to become a low-temperature, low-pressure refrigerant, which enters the outdoor finned heat exchanger 6. Under the action of the fan 5, it enhances its heat exchange with the air, evaporating into a low-temperature, low-pressure superheated gas, and returning to the first compressor 1 or the second compressor 2, completing the heating cycle. The refrigerant flow direction for heating is: first compressor 1 or second compressor 2 → indoor water-side heat exchanger 10 → electronic expansion valve 9 → outdoor finned heat exchanger 6 → first compressor 1 or second compressor 2.

[0090] like Figure 3 The diagram shown is a flowchart of the compressor load control during heating, including the following steps:

[0091] S301, when the user presses the power button, the unit's water pump starts.

[0092] S302 performs temperature detection, obtains the indoor target temperature T1 (i.e., target water temperature) and the outdoor ambient temperature T2, calculates the temperature difference T1-T2, and makes a judgment based on the temperature difference.

[0093] S303, when T1-T2≤B, proceed to heat calculation. Let T1-T2=X. Further analysis is performed based on the value of X to determine the initial load when the first compressor 1 is turned on.

[0094] The formula for calculating heat exchange is Q = KA(T1 - T2), where Q represents the calculated heat exchange value, K represents the structural heat transfer coefficient, and A represents the structural area. Since K and A are constants, the temperature difference X determines the value of Q. In winter, a larger temperature difference X results in a larger Q, requiring full-load operation; in summer, a smaller temperature difference X results in a smaller Q, requiring further analysis to determine the initial load.

[0095] In this example, the load settings for the first compressor 1 are as follows: minimum compressor load F1 (e.g., 25%), second-level compressor load F2 (e.g., 50%), third-level compressor load F3 (e.g., 75%), and maximum compressor load F4 (e.g., 100%).

[0096] S304, if A < X ≤ A1, after the start-up water temperature is met, start the first compressor 1 and adjust it to the minimum load F1.

[0097] S305, after the first compressor 1 is adjusted to run at F1 for v time, monitor the water temperature T3.

[0098] S306 If T3≈T1 (with an accuracy of z, i.e., T1-z<T3<T1+z) is detected for a continuous time t1, the first compressor 1 maintains the current load operation.

[0099] S307, if T3≤T1-z is detected for a continuous time t1, the load of the first compressor 1 is increased by 25%, i.e., it is loaded to F2.

[0100] S308: If T3 ≥ T1 + z is detected for a continuous time t1, or if the first compressor 1 is detected to start and stop repeatedly n times within a time period S, then switch to the second compressor 2 (i.e., turn on the second compressor 2 and turn off the first compressor 1), and simultaneously close solenoid valves 3, 4, 7, and 8. After the second compressor 2 starts, the water temperature T3 and the running time of the second compressor 2 are monitored simultaneously.

[0101] S309, when t < Y, if T3≈T1 (accuracy z) is detected for a continuous time t1, the second compressor 2 continues to operate in the current state.

[0102] S310, when t < Y, if T3 ≤ T1 - z is detected for a continuous time t1, switch to the first compressor 1 and start the first compressor 1 to load F1.

[0103] S311, when t≥Y, switch to the first compressor 1 and start the first compressor 1 at load F1.

[0104] S312, if A1<X≤A2, after the start-up water temperature is met, start the first compressor 1 and adjust it to the second load F2.

[0105] S313, if A2<X≤B, after the start-up water temperature is met, start the first compressor 1 and adjust it to the third load level F3.

[0106] S314, after running for v time, monitor the water temperature T3.

[0107] S315, if T3≈T1 (accuracy z) is detected for a continuous time t1, control the first compressor 1 to maintain the current state and continue to run.

[0108] S316 If T3≤T1-z is detected for a continuous time t1, then the first compressor 1 is loaded, for example, by increasing the load by 25%.

[0109] S317 If T3≥T1+z is detected for a continuous time t1, or if the compressor is detected to start and stop repeatedly n times within time S, then the first compressor 1 is unloaded, for example, by reducing its speed by 25%.

[0110] S318, when T1-T2>B, after the start-up water temperature is met, the first compressor 1 starts and runs at full load F4.

[0111] S319, after running for v time, monitor the operation of the first compressor 1. When it is detected that the first compressor 1 starts and stops repeatedly n times within S time, unload the first compressor 1. Specifically, reduce the load by 25% to adjust to load F3.

[0112] S320, if X≤A, after the start-up water temperature is met, start the second compressor 2.

[0113] It should be noted that for steps S304 and S320, a deviation h can be set for A (for example, h can be 1 to 2℃) to improve control reliability. That is, when Ah < X ≤ A1, after the start-up water temperature is met, the first compressor 1 is turned on and adjusted to the minimum load F1; when X is less than Ah, the second compressor 2 is turned on.

[0114] In addition, after adjusting the compressor, the outdoor heat exchanger is also controlled accordingly. Specifically, when the first compressor 1 is turned on, the outdoor heat exchanger is fully open, and solenoid valves 3, 4 and 7, 8 are all open; when the second compressor 2 is turned on, the outdoor heat exchanger is partially connected to the refrigerant circuit, and solenoid valves 3, 4 and 7, 8 are closed.

[0115] If a change in outdoor ambient temperature is detected (e.g., temperature difference between day and night or seasonal changes) or a change in indoor target temperature, this method can be executed starting from step S302.

[0116] The parameters and their meanings used in this embodiment are explained below with reference to Table 1.

[0117] Table 1. Parameter Meaning Table

[0118]

[0119]

[0120] Where B > A2 > A1 > A, t1 < Y. B, A2, A1, and A can be set according to the climate conditions of the area where the air conditioning unit is located and actual needs. The values ​​of v and Y can be larger, for example, 10 hours.

[0121] This embodiment determines the unit's status and required heating capacity by detecting compressor running time, compressor start-stop status, outdoor ambient temperature, and actual indoor temperature. It selects flow paths and components suitable for the current conditions, and then adjusts the compressor running time and capacity through further monitoring and judgment. This balances low-temperature heating in winter and high-temperature heating in summer, ensuring reliable unit operation while maintaining stable water temperature to meet user heating needs. It avoids achieving user heating needs at the expense of frequent compressor start-stops, while ensuring unit operating capacity. This effectively solves the problem of frequent compressor start-stops caused by the mismatch between compressor load and required energy when air conditioning units are used for both low-temperature heating in winter and high-temperature heating in summer.

[0122] Example 3

[0123] Based on the same inventive concept, this embodiment provides an air conditioning unit heating control device, which can be used to implement the air conditioning unit heating control method described in the above embodiments. The air conditioning unit includes a first compressor and a second compressor connected in parallel, wherein the rated heating capacity of the first compressor is greater than that of the second compressor. This device can be implemented by software and / or hardware.

[0124] Figure 4 This is a structural block diagram of the air conditioning unit heating control device provided in Embodiment 3 of the present invention, as shown below. Figure 4 As shown, the device includes:

[0125] Calculation module 41 is used to calculate the difference between the indoor target temperature and the outdoor ambient temperature;

[0126] The first determining module 42 is used to determine the compressor that needs to be turned on based on the difference;

[0127] The second determining module 43 is used to determine the initial load of the first compressor based on the difference when the first compressor needs to be turned on.

[0128] The control module 44 is used to adjust the load of the first compressor or switch the compressor according to the actual indoor temperature and the current load of the first compressor until the actual indoor temperature reaches the target indoor temperature.

[0129] Optionally, the first determining module 42 is specifically used for:

[0130] If the difference is greater than the first threshold, the current operating condition is determined to be low-temperature heating, and the first compressor is turned on;

[0131] If the difference is less than or equal to the first threshold, the current operating condition is determined to be high-temperature heating, and the compressor to be turned on is determined according to the interval in which the difference is located. Specifically, when the interval in which the difference is located is the minimum interval, the second compressor is turned on; when the interval in which the difference is located is not the minimum interval, the first compressor is turned on.

[0132] Optionally, the second determining module 43 is specifically used to: determine the interval where the difference is located; determine the load level corresponding to the interval where the difference is located according to the pre-stored correspondence between the interval and the load level, as the initial load of the first compressor; wherein, the first compressor is provided with a minimum load level, at least one intermediate load level and a maximum load level; the smaller the interval, the smaller the corresponding load level.

[0133] Optionally, the control module 44 includes:

[0134] The first acquisition unit is used to acquire the actual indoor temperature after the first compressor has been running at the minimum load setting for a first preset time, if the current load of the first compressor is at the minimum load setting.

[0135] The first control unit is configured to control the first compressor to maintain the current load operation if the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value and less than the sum of the indoor target temperature and the preset value for a continuous second preset time.

[0136] The second control unit is configured to, if the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, increase the first compressor to the next load level after the minimum load level.

[0137] The third control unit is configured to shut down the first compressor and start the second compressor if the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and a preset value for a second consecutive preset time, or if the first compressor is repeatedly started and stopped a preset number of times for a third consecutive preset time.

[0138] Optionally, the control module 44 is further configured to: after the second compressor is turned on,

[0139] If the actual running time of the second compressor is greater than or equal to the fourth preset time, then switch to the first compressor, and the first compressor is turned on to the minimum load setting;

[0140] If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value, then the second compressor is controlled to continue running.

[0141] If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is less than or equal to the difference between the indoor target temperature and the preset value, then the compressor is switched to the first compressor, and the first compressor is set to the minimum load setting.

[0142] Optionally, the control module 44 includes:

[0143] The second acquisition unit is used to acquire the actual indoor temperature after the first compressor has been running at the intermediate load setting for a first preset time if the current load of the first compressor is at the intermediate load setting.

[0144] The fourth control unit is configured to control the first compressor to maintain its current load operation if the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value for a second consecutive preset time.

[0145] The fifth control unit is configured to increase the first compressor to the next load level of the current load if the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time.

[0146] The sixth control unit is configured to reduce the first compressor to the previous load level if the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time, or if the first compressor is repeatedly started and stopped a preset number of times for a third consecutive preset time.

[0147] Optionally, the control module 44 includes:

[0148] The judgment unit is used to determine whether the number of times the first compressor has been repeatedly started and stopped within a third consecutive preset time has reached a preset number after the first compressor has been running at the maximum load setting for a first preset time, if the current load of the first compressor is the maximum load setting.

[0149] The seventh control unit is used to reduce the first compressor to the load level above the maximum load level if the number of times the first compressor is repeatedly started and stopped within a third consecutive preset time period reaches a preset number.

[0150] Optionally, the air conditioning unit further includes: at least two outdoor heat exchangers connected in parallel; when the first compressor is turned on, all outdoor heat exchangers are turned on; when the second compressor is turned on, a specified portion of the at least two outdoor heat exchangers are turned on.

[0151] The above-described apparatus can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided in the embodiments of the present invention.

[0152] Example 4

[0153] This embodiment provides an air conditioning unit, including: the air conditioning unit heating control device described in the above embodiment.

[0154] Example 5

[0155] This embodiment provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method described in the above embodiment.

[0156] Example 6

[0157] This embodiment provides a non-volatile computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the steps of the method described in the above embodiment.

[0158] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0159] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heating control method for an air conditioning unit, characterized in that, The air conditioning unit includes a first compressor and a second compressor connected in parallel, wherein the rated heating capacity of the first compressor is greater than that of the second compressor, and the method includes: Calculate the difference between the target indoor temperature and the outdoor ambient temperature; The compressor that needs to be turned on is determined based on the difference. When the first compressor needs to be turned on, the initial load of the first compressor is determined based on the difference. Then, based on the actual indoor temperature and the current load of the first compressor, the load of the first compressor is adjusted or the compressor is switched until the actual indoor temperature reaches the target indoor temperature, including: If the current load of the first compressor is at the minimum load setting, the actual indoor temperature is obtained after the first compressor has been running at the minimum load setting for a first preset time. If the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value for a second consecutive preset time, then the first compressor is controlled to maintain the current load operation. If the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, the first compressor will be increased to the next load level after the minimum load level. If the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time, or if the first compressor repeatedly starts and stops a preset number of times for a third consecutive preset time, then the first compressor is turned off and the second compressor is turned on. After the second compressor is turned on, the following is also included: If the actual running time of the second compressor is greater than or equal to the fourth preset time, then switch to the first compressor, and the first compressor is turned on to the minimum load setting; If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value, then the second compressor is controlled to continue running. If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is less than or equal to the difference between the indoor target temperature and the preset value, then the first compressor is switched on, and the first compressor is turned on to the minimum load setting. Determining which compressor needs to be turned on based on the difference includes: If the difference is greater than the first threshold, the current operating condition is determined to be low-temperature heating, and the first compressor is turned on; If the difference is less than or equal to the first threshold, the current operating condition is determined to be high-temperature heating, and the compressor to be turned on is determined according to the interval in which the difference is located. Specifically, when the interval in which the difference is located is the minimum interval, the second compressor is turned on; when the interval in which the difference is located is not the minimum interval, the first compressor is turned on.

2. The method according to claim 1, characterized in that, Determining the initial load of the first compressor based on the difference includes: Determine the interval containing the difference; Based on the pre-stored correspondence between intervals and load levels, the load level corresponding to the interval containing the difference is determined and used as the initial load of the first compressor. The first compressor is equipped with a minimum load setting, at least one intermediate load setting, and a maximum load setting; the smaller the range, the smaller the corresponding load setting.

3. The method according to claim 1, characterized in that, Based on the actual indoor temperature and the current load of the first compressor, adjust the load of the first compressor or switch compressors until the actual indoor temperature reaches the target indoor temperature, including: If the current load of the first compressor is at the intermediate load setting, the actual indoor temperature is obtained after the first compressor has been running at the intermediate load setting for a first preset time. If the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value for a second consecutive preset time, then the first compressor is controlled to maintain the current load operation. If the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, then the first compressor will be increased to the next load level of the current load. If the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time, or if the first compressor repeatedly starts and stops a preset number of times for a third consecutive preset time, then the first compressor will be reduced to the load level above the current load.

4. The method according to claim 1, characterized in that, Based on the actual indoor temperature and the current load of the first compressor, adjust the load of the first compressor or switch compressors until the actual indoor temperature reaches the target indoor temperature, including: If the current load of the first compressor is the maximum load setting, after the first compressor runs at the maximum load setting for a first preset time, it is determined whether the number of times the first compressor repeatedly starts and stops within a third preset time has reached a preset number. If so, the first compressor is reduced to the load level above the maximum load level.

5. The method according to claim 1, characterized in that, The air conditioning unit also includes at least two outdoor heat exchangers connected in parallel; With the first compressor running, all outdoor heat exchangers are activated. When the second compressor is turned on, a specified portion of the at least two outdoor heat exchangers is turned on.

6. A heating control device for an air conditioning unit, characterized in that, The air conditioning unit includes a first compressor and a second compressor connected in parallel, wherein the rated heating capacity of the first compressor is greater than that of the second compressor, and the device includes: The calculation module is used to calculate the difference between the indoor target temperature and the outdoor ambient temperature. The first determining module is used to determine the compressor that needs to be turned on based on the difference; The second determining module is used to determine the initial load of the first compressor based on the difference when the first compressor needs to be turned on. The control module is used to adjust the load of the first compressor or switch compressors based on the actual indoor temperature and the current load of the first compressor until the actual indoor temperature reaches the target indoor temperature. The control module includes: The first acquisition unit is used to acquire the actual indoor temperature after the first compressor has been running at the minimum load setting for a first preset time, if the current load of the first compressor is at the minimum load setting. The first control unit is configured to control the first compressor to maintain the current load operation if the actual indoor temperature is detected to be greater than the difference between the indoor target temperature and the preset value and less than the sum of the indoor target temperature and the preset value for a continuous second preset time. The second control unit is configured to, if the actual indoor temperature is detected to be less than or equal to the difference between the indoor target temperature and the preset value for a second consecutive preset time, increase the first compressor to the next load level after the minimum load level. The third control unit is used to shut down the first compressor and start the second compressor if the actual indoor temperature is detected to be greater than or equal to the sum of the indoor target temperature and the preset value for a second consecutive preset time, or if the first compressor is repeatedly started and stopped a preset number of times for a third consecutive preset time. The control module is further configured to: after the second compressor is turned on... If the actual running time of the second compressor is greater than or equal to the fourth preset time, then switch to the first compressor, and the first compressor is turned on to the minimum load setting; If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is greater than the difference between the indoor target temperature and the preset value but less than the sum of the indoor target temperature and the preset value, then the second compressor is controlled to continue running. If the actual running time of the second compressor is less than the fourth preset time, and the actual indoor temperature is less than or equal to the difference between the indoor target temperature and the preset value, then the first compressor is switched on, and the first compressor is turned on to the minimum load setting. Determining which compressor needs to be turned on based on the difference includes: If the difference is greater than the first threshold, the current operating condition is determined to be low-temperature heating, and the first compressor is turned on; If the difference is less than or equal to the first threshold, the current operating condition is determined to be high-temperature heating, and the compressor to be turned on is determined according to the interval in which the difference is located. Specifically, when the interval in which the difference is located is the minimum interval, the second compressor is turned on; when the interval in which the difference is located is not the minimum interval, the first compressor is turned on.

7. An air conditioning unit, characterized in that, include: The air conditioning unit heating control device as described in claim 6.

8. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 to 5.

9. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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